Mitsubishi FR-A800

Connection of stand-alone option units
INSTALLATION AND WIRING
71
2
2.9 Connection of stand-alone option units
The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the option unit carefully in accordance with
the corresponding option unit manual.
2.9.1 Connection of the dedicated external brake
resistor (FR-ABR)
For FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or lower, the plug-in brake resistor is connected across
terminals P/+ and PX.
When the plug-in brake resistor does not have enough thermal capability for high-duty operation, install an external dedicated
brake resistor (FR-ABR). At this time, remove the jumper from across terminals PR and PX and connect the FR-ABR across
terminals P/+ and PR. (For the locations of terminal P/+ and PR, refer to the terminal block layout (page 38).)
Removing jumpers across terminals PR and PX disables the plug-in brake resistor (power is not supplied). The plug-in brake
resistor can be left connected to the inverter, and so is the plug-in brake resistor's lead wire connected to the terminal.
The FR-ABR can be applicable to FR-A820-01250(22K) or lower and FR-A840-00620(22K) or lower.
Set parameters as below.
• Pr.30 Regenerative function selection = "1"
• Pr.70 Special regenerative brake duty = "7.5K or lower: 10%, 11K or higher: 6%"
(Refer to page 614.)
FR-A820-00046(0.4K), FR-A820-00077(0.75K)
FR-A820-00105(1.5K) to FR-A820-00250(3.7K),
FR-A840-00023(0.4K) to FR-A840-00126(3.7K)
FR-A820-00340(5.5K), FR-A820-00490(7.5K), FR-A840-00170(5.5K), FR-A840-00250(7.5K)
Brake resistor
Jumper
Terminal PR
Terminal PX
Terminal PR
1) Remove the screws in
terminals PR and PX
and remove the jumper.
2) Connect the brake resistor
across terminals P/+ and PR.
(The jumper should remain
disconnected.)
Terminal P/+
Jumper
Terminal PR
Terminal PX
Terminal PR
Terminal P/+
Brake resistor
1) Remove the screws in terminals
PR and PX and remove the jumper.
2) Connect the brake resistor
across terminals P/+ and
PR. (The jumper should
remain disconnected.)
Terminal PX
Jumper
Terminal P/+
Terminal PR
Terminal PR
Brake resistor
1) Remove the screws in terminals PR
and PX and remove the jumper.
2) Connect the brake resistor across
terminals P/+ and PR. (The jumper
should remain disconnected.)